Protective device



Jan. 1; 1929. 1,697,199

E. C. M KENZIE-MARTYN PROTECTIVE DEVICE Filed April 17, 1922 2 Sheets-Sheet 1 F'IIGZ I FIG.1

FIG?) flan. 1, 1929.

1,697,199 E. c. MCKENZIE-MARTYN PROTECTIVE DEVICE Filed April 17 1922 2 Sheets-Sheet, 2

. I mmm Patented 1, 1929.

UNITED "STATES PATENT FICVE.

EDWARD C. MCKENZIE-MART, 01; SHORT HILLS, NEW JERSEY, ASSIGNOR TO STAlNID- ARI) OIL DEVELOPMENT COMPANY, A CORPORATION OF DELAWARE.

PROTECTIVE DE ICE.

4 Application filed April 17, 1922. Serial No. 558,701.

My invention relates to valves and protec- ,tive devices, used on systems andreceptacles containing fluids and particularly where there is more or less corrosive action. The features and utilities of the invention will be clearly understood as the description proceeds, reference being had to the accompanying drawings, in which- Fig. 1 is a vertical section of an embodiment of my invention;

Fig. 2 is a similar view showing the relation of assemblage;

liziig. 3 is a perspective detail of a guard r1 7V g Fig. 4 is a vertical section showing a detaili of a modified form of protective device, an

Fig. 5 is a similar view showing further modifications and assemblage.

The numeral 1 designates a container in which there is fluid and whilemyinvention is applicable 'over a considerablerange, including not only simple systems and receptacles, but also special apparat'us'in which chemical vapors and gases are contained at low temperatures, also heated a paratus such igesters, vulas steam boilers, autoclaves, canizers, chemical stills. etc., by way of example the invention will be described asapplied to an oil still, as this well'exemplifies an extreme case, in which vapors which are corrosive, hot, and underpressure have to be reckoned with. In some of the more recent- -ly used petroleuin's, sulfur compounds are present-in considerable amount and these under still conditions form 'vaporous constituents which exercise a corrosive action such as to damage safety valves of the usual -types. Continued ex osure on the still side 40 results in corrosion a ong the valve disc and seat such .as either to produce leaks, or what is worse, cause sticking.

In the drawing, since the construction of the still itself is nopart of my invention, for

4.5 simplification only asufiicient portion of the upper wall thereof is-shown tomakeclear. the relationship of my invention. Connect-- ed to the still is a safety valve A (see Fig; 2), the detail construction of which may beconventionally represented as comprising a valve-disc 2 on a stem 3 slidable in the oke 4 and" held at a predetermined pressure y a spring 5. J oining the valve and the still is a housing 6 fastened to the respective flanges to by suitable means, such as bolts 6". The

no wise interfered with.

more accurate release at thepressure desired material of known coelficient so as to shear at a predetermined pressure. Preferably the housing provides a frame-seating for a protective septum 7 clamped tightly in place by suitable clamping means 8, and made of non-corrosive or slightly corrosive material,

The

such .as Monel metal or aluminum. thickness of the septum is so gagedthatit, will rupture at about the predetermined pressure for which the safety valve is set, or the sc tum may be made rather thick and be suitably scored to'break out. It is thus seen that the valve surfaces are normally shielded against corrosive action and yet, through rupture of the septum at the predetermined pressure the functioning of the. safety valve is in In the use of such septa it occasionally is. necessary to get at the septum for inspection, or for renewal when the valve has blown, and if this be accomplished by demount-ing the valve, serious loss of time results, also difiiculties in always securing tight joints. To

meet this, I have particularl provided for ready access.. In the form il ustrated in the drawings this comprises cover plates 9, detachably held by fastening means 'such as screws 10. Such covers may be positioned as desired, so as to afi'ordaccess; a double set, fore and aft as shown being particularly use.- ful, however a cover on the still side must be gasketed tightly against leaks, while a cover aft need not be so carefully tight. v

' i To prevent pieces of a broken septum from jamming in the valve seat I'provide a catcher or guard grid 11. This may be of any suitable form, from cast metal to heavy wire a convenient holding means, being simply clamped under the cover plate. p

In some instances it is desirable to use a plurality of septa, as shown in Fig. 2, since with some materials there is a slight variation in the yield pointfor septa similarly prepared, and with more than one available,

is secured.

In the -modifications shown in Figs. l and 5 of the drawings, the septum 7 is made more fragile, not being intended to carry any pressure load, and is. backed up by a close fitting follower 13 whose stem 14 is slidably mount-- ed in the cover plate 9 and is held in position by a break-pin 15, the pin being made of I: break-pin is placed through a slidable block 16 (see Fig. 4) in' a cap 17 mounted on the boss projection ofcover plate 9 by suitable -means, such as screw thre'adi so as, to abut against the stem 14 when in position.

ossible the .use of,

This construction makes already charge-d mounts o break-pins; after a blow-out it being-merely'necessary to renew the septum and remove the cap 17 with the sheared pin andsubstitute another cap carrying a block 16 and new pin, the operatlon requiring but a few moments time.

If desired, the break-pin maymore simply be placed directly through a boss'enlargement of the cover plate 9 as shown in the lower mounting in Fig. '15, or advantageously a cap or casin 18-. may be placed over the plunger stem an filled with oil to lubricate and to act as'a dash-pot, the oil displaced finding exit by any stance escape duct 19 along the stem into the housing.

In the modifications shown in Figs. 4 and 5, a weighted safety valve or any other desired type may be mounted above the housing 6, t

e throatwa of the valve below the disc being indicate at A, Fig. 5, the further detail of such valve being immaterialhere. However for some usesllcontemplate omitting the standard safety valve and in such cases my septum and special mounting make a very reliable safety valve of itself as the factor of corrosion-damage is eliminated and by use convenient arrangement, as for in saidbacking plunger,

of theproper break-out element the disired pressure limit set is readily attained. While I have described my invent-ion with reference to certain details of embodiment, it

is to be understoodthat this is illustrative,

and not limitative, and the invention is to be regarded as limited only by the claimsbelow.

What I claim'isf 1. In a device of the character described,

the combination of a pressure fluid-holding apparatus, a plurality of protective septa, a housing for said septa, and a removable cover affording access to the septa without disturbing the connection of the housing to the ap- 1 paratus. 2. In a device of the character described,

the combination of a protective septum, a

in for supporting necting with thecap.

4. Ina'device'of the character the combination of a protective backing plunger, a detachable cap of the plunger, and a break-pin within said described, septum, a

the character described,

a detachable cap 3 a detachablecap at the i rear of theplpnger, and an outlet duct con at the rear nnwhnhc, MeKENzIn-MARTYN.

i: 3 ax 

